Taper attachment for lathes.



LR. SEWARD.

TAPER ATTACHMENT FOR LATHES. APPLICAUOH FILED pcT. 14` 1915.

J 7H@ Paten-ted July 17x, 1917 2 SHEETS-SHEET 2- ill ERNEST R. SEVARD, F MADISON, 'ISCONSIN, ASSIGNOR 'IO GISHOLT MACHINE `CDSM-- PANY, OF MADISON, .UISCGNSIN, A CORPORATIUN 0F "W'SClifSIliLl TAPER ATTACHMENT LATHES.

ieeeii, l

specificati on.

lhisinvention relates to lathes, and has for its moin. object. to provide 'a simple, conveniently accessible, and easily manipu- .lntedpattachn'ient for effecting ianiorni taper cute of various angles on a piece held in the The improvement constituting my preeent invention, its inode of use, and its advantages will all he readily understood hy those skilled inthe `art :from the following detailed description taken in connection with thefac companying drawings wherein l have illustrated one practical and preferred einhediment ot 'the invention, and in whichdit Figure l :is a top plan View of a portion of the lathe-hed, carriage, cross slide and tool h'locl. elfiowinginy invention applied thereto g Fig. 2 is a side elevation oll the parts shown Fig. l; l

Fig', 3 is: a cross section on the line 3-3 of Fig, 2;

Fig. et is a cross section on the line 4-4t Of'lfig. 2:

' Figi 5 is a detail crossvsection on the line l 5IN-5 of Fig. l. i

s the general construction and organiza tionof lathes oi the type to which my present'invention is adapted nre well understood, l' have herein illustrated ine fragmentary wey only such portions of the inthe as di-- rectly cooperate with iny present .in 1provement. In the drawings l designates ythe carriage that is mounted to slide on and lengthwise'of the usual ways 2 of the lathehed.` 3 is the cross slide mounted 'in snitable' ways on the carriage, ande is the tool block mounted on the carriage 3 The carriage Ijs providedwith the usual depend- Y ing tipron 5, and ie also formed with en in 'terri-ail extension 6 that overhangs the front eide oit the iathebed. Secured to the cross siide 3 is e non-revolving feed screw which cooperates with anut 8 keyed to the inner end of a tubular shaft 9 that is jonrnaled in hearing; 10 ofthe cross slide and on its outer end carries a. hand wheel l1 .for

Speccaton of Letters Patent. Application filed ltctooer 14, 1915. Serial No.

have, invented certain new '9 against fendwise Patented Joly it?, tiix effecting manual feed ofthe cross' slidefin the manner hereinafter described.' i Boltedor otherwise secured to the under side of the carriage extension G is a (-,honi'inelM shaped bracket that forms support and guide fora slide bar 13. The bracket 12"" has a doveteiled groove 14 in its hottoinfthet is engaged byv a dove-tailed rack-har l'l'on the ondereide of the slide har 13; such reelle bar being confined in' the groove vby a suity able gib 16. Pivotedon the Slide har`13et" l (Fig. 4f) is a,channel-shaped*Swivel'hnr 13,one end of which carries o clamp holt 19 (Figs. l and 5), the heed or' which engagesa transverse T-siot in one end of the Slide bar 13. On the slide har adjacent to theY 'lil slot .is a scale 21 cooperating with e pointer 22 on the end of the swivel'har, whereby,

to determine the angle at "which tlieewivel ofthecerriage.- Fitting the swivel bar 8; with capacity' :for relative siidingg inoveno'itf7 is a block 23 having-e round stem or stnd'tet on its 'upper side that enters the inner end ont ev fiat bar 25 (Fig. t) that isslidably mount;- ed in and crosewiee of the carriage extension 6. The outer end-of bar 25 is Secured to e bracket piece 2G that embraces and is con'- ned on the reduced outer-end 9 ofthe hand feed sli/aft 9. A set crew 27 mounted in the forwerdside ofthe guide hraclrettl" clamps the her 2Q and consequently the -shett movenlent when it is de?A sii-ed to use the regular hond or power feed` on the cross slide instead of the taper feed? Referring to Fig. 3, beneath one oit' the" ways 2 of thelathefhed is mounted 'a lined raclohar 28 with which engages e pinion'g on the inner end of a shaft 30, seid Shaft' hee ing journeled in a bushing 31 carried-hy Seidf carriage apron 5. Keyed to the: forwardporti'onofshnft 30 is :mother pinion 32 that] meshes with the rack-bar l5 carried lhy the slide bar 13. and the pinion 32 are housed ine dei,` pressed portion 12 of thegnide bracket-12," and the forward end of the shaft entends"v through the letter and is provided with knob 33 hy which the shaft may he pulledf forwardly sufficiently 4to disengage the pin# ion` 29 from the rock-her 28, While reltein` ing engagement of pinion 32 with the wide ttf The forward portion of shaft:

tot

' 9 is a wide pinion 34 (Fig. 4) engaged by "an idler gear 3 5; said pinion and gear form- Y ing elements of a gear train leading from a continuously rotating shaft (not shown) in 5 the lower portion ofthe lathe-bed for effecting a power feed ofthe cross slide, when desired; such power feed being illustrated and described in my Letters Patent No. 1,168,683, dated J an. 18, 1916, and forming no part of the present invention.

Brieiy 'describing the operation of the present improvement, when it is desired to turn a taper on a piece heldl infthe lathe, the operator by manipulating the ciamp bolt 19 setsthe swivel bar 18 at the desired number of degrees as indicated by the scale 21. When the carriage 1 is fed by hand 0r powerv in veither direction, the pinion 29 meshing with the stationary rack 28 imparts a rotary motion to shaft 30 and pinion 32, ,p which 1n turn moves 'the slide bar 13 and lswivel bar 18 lengthwise with relation to the carriage 1, and the channel of the swivel-` bar in which the block 23 is mounted imwhich is transmitted to the cross-slide and tool block through bar 25, bracket 26, shaft 9, nut 8 and screw 7, it being understood that at such timethe set-screw 27" is retracted to permit free sliding movement of .the bar 25. When it is desired to turn straight work instead of tapered work, the operator pulls out the knob 33 thereby `disengaging pin- 4 ion 29 from rack-bar 28. He then tightens 35 up the set-screw 27 against the lower side '1 of bar 25 which holds bracket 26 in a fixed position. He can then apply the hand' feed in and out'by means of the hand-wheel 11 acting through shaft 9 and nut A8v on the cross 40 feed through the gear 35 and pinion 34, as desired.A f l' Without limiting myself to the precise described, y

claim:

1. In a taper attachment for lathes, the combination with a carriage '.mounted to travel on the ways of the lathe-.bed and having an apron, of a crossslideon said carriage, a slidebar guide rmid with said barriage,a slidelbar, supported by and movable lengthwisev relatively4 to said-guide, a lon 1- tudinally extending rack-bar on said sli ebar, a swivel-bar plvotally mounted on said slide bar, means for securing said ,swivelbar it any predetermined angle to the linel of movement of said carriage, a block hav- Jing relative sliding. engagement with and G0-lengthwise of' said swivel-bar, connections betweenv said block and said cross slide, a 'xed rack-bar on the lathe-bed, a shaft journaled in said carriage apron, a pinion on i v said shaft engaging Asaid rst named rackbar, another piniqn on said shaft engaging parts 'an in and out movement to block 23 feed screw 7 or he can apply the power cross tails of constructionfherein shown and desaid last named rack-bar,I and manually operable means for disengaging one of said pinions from its coperatlng rack-bar.

2. In a taper attachment for lathes, the combination with a carriage mounted. to travel on theways of the lathe-bed, of a cross slide thereon, an endwise movable shaft having a screw-feed connection to said cross slide, a hand-wheel on the outer end of said shaft, a slide-bar guide rigidwith said carriage, a slide-bar supported by and movable lengthwise relatively to said guide, a. swivel-v.

vbar pivotally mountedl on said slide-bar, means for securing said swivel-bar parallel 'with the travel of said carriage, and means for locking said shaft against endwise move-- ment to permit hand-feed of said cross slide.

,3. In a taper attachment for lathes.'tl\.` combination with a carriage mountedv --to travel on the ways ofthe lathe-bed andhaving an' apron, of a cross slide on said carriage, an endwise movable shaft having a 'screw-feed connection to said cross-slide, a

hand wheel on the outer end of said shaft,

slide-bar supported byand movable lengthwisc relatively to said guide, a longitudinally extending rack-bar on said slide-bar, a swivel-bar pivotallymounted on said slide'i a slide-bar guide rigid with said carriage, a'.

bar, means for securing said swivel-bar parallel with or at any predetermined angle to the line of movement of said carriage, a block having relative sliding en agement with and lengthwise of said swivelar, connections between said block and said endwis movable shaft, a fixed rack-bar on the lathe bed,4 a shaft 'journaled in said carriage apron, a pinion on said shaft engaging sald first-named rack-bar, ahotherpinion on said shaft engaging said last-named rack-bar, manually operable means for disengaging, one of said pinions from its coperating raclnbar, and means for locking said firstnamed shaft against endwise movement to permit hand feed of said cross slide.

4.' -In a taper attachment for lathes, the combination with a carriage mounted to travel on the ways of the lathe-bed Vand hav- 'ing an apron, of a cross slide on said'cwrriage, -an endwise movable shaft having a screw-feed connection to-said cross slide, a

hand wheel on the outer end of said shaft, a

slide-barguide rigid with said carriage, a slide bar supported by' and movable lengtl."

. wise relativel to said guide, a longitudinally extending rac -bar 'on said slide-bar, a swivelwat bar pivotally mounted v.on saidslide --bar,v meansfor securingsaid swivel-barat any pre` 1 3 0 determined angle to the line of movement of shaft engaging said elast-named rack-bar, ,10

said carriage, a, blook'having relative slidone of said rack-bars beingeulieientlywide ing engagement with and. lengthwise of said to remain engaged with its pinion w11entl1e swivel-bar,4 connections between 'said block other pinion has been disengaged from its 5 and said endwse movable shaft, a fixed eoperating rack-bar by longitudinal moverack-banon the lathe-bed, an endwise movment of said last-named shaft, and man-UL- 15 able shaft .journaled in said carriage-apron, ally operable means for effecting such longil a pinion on said, shaft' engaging said firsttdinal movement of said la`stna1ned shaft.

. mentioned rack-bai'. another ninion ori-said e A ERNEST R. SEWARD. 

